The invention describes compounds represented by the general formula (I) given below: in which: n is an integer between 1 and 4 R1 and R2 are chosen independently from hydrogen and a methyl group R3 is chosen independently from a linear, branched or cyclic alkyl group containing from 1 to 3 carbon atoms (R3a) and a simple amino group (R3b) or an amino group substituted with a nitro group (R3c). The compounds are useful for treating central nervous system diseases or peripheral neuropathies.